clypi 1.0.1

Your all-in-one for beautiful, lightweight, prod-ready CLIs

🦄 clypi

Your all-in-one for beautiful, lightweight, prod-ready CLIs

Get started

uv add clypi  # or `pip install clypi`

Examples

Check out the examples in ./examples! You can run them locally with uv run --all-extras -m examples.<example>. E.g.:

uv run --all-extras -m examples.cli

# Or:
pip install .[examples]
python -m examples.cli

Docs

Read the API docs for examples and a full API reference.

CLI

Read the docs

# examples/basic_cli.py
from clypi import Command, Positional, arg

class Lint(Command):
    files: Positional[tuple[str, ...]]
    verbose = arg(...)  # Comes from MyCli but I want to use it too

    async def run(self):
        print(f"Linting {', '.join(self.files)} and {self.verbose=}")

class MyCli(Command):
    """
    my-cli is a very nifty demo CLI tool
    """
    subcommand: Lint | None = None
    verbose: bool = arg(
        help="Whether to show extra logs",
        prompt="Do you want to see extra logs?",
        default=False,
        short="v",  # User can pass in --verbose or -v
    )

    async def run(self):
        print(f"Running the main command with {self.verbose}")

if __name__ == "__main__":
    cli: MyCli = MyCli.parse()
    cli.start()

uv run -m examples.basic_cli lin (Typo)

uv run -m examples.basic_cli -h (Main help page)

uv run -m examples.basic_cli lint -h (Subcommand help page)

uv run -m examples.basic_cli (Normal run)

uv run -m examples.basic_cli lint (Missing args error)

🌈 Colors

Read the docs

# demo.py
import clypi

# Style text
print(clypi.style("This is blue", fg="blue"), "and", clypi.style("this is red", fg="red"))

# Print with colors directly
clypi.print("Some colorful text", fg="green", reverse=True, bold=True, italic=True)

# Store a styler and reuse it
wrong = clypi.styler(fg="red", strikethrough=True)
print("The old version said", wrong("Pluto was a planet"))
print("The old version said", wrong("the Earth was flat"))

uv run -m examples.colors

uv run demo.py

🌀 Spinners

Read the docs

# demo.py
import asyncio
from clypi import Spinner

async def main():
    async with Spinner("Downloading assets") as s:
        for i in range(1, 6):
            await asyncio.sleep(0.5)
            s.title = f"Downloading assets [{i}/5]"

asyncio.run(main())

uv run -m examples.spinner

uv run demo.py

❓ Prompting

Read the docs

First, you'll need to import the clypi module:

import clypi

answer = clypi.prompt("Are you going to use clypi?", default=True, parser=bool)

🔀 Async by default

clypi was built with an async-first mentality. Asynchronous code execution is incredibly valuable for applications like CLIs where we want to update the UI as we take certain actions behind the scenes. Most often, these actions can be made asynchronous since they involve things like file manipulation, network requests, subprocesses, etc.

🐍 Type-checking

This library is fully type-checked. This means that all types will be correctly inferred from the arguments you pass in.

In this example your editor will correctly infer the type:

hours = clypi.prompt(
    "How many hours are there in a year?",
    parser=lambda x: float(x) if x < 24 else timedelta(days=x),
)
reveal_type(hours)  # Type of "res" is "float | timedelta"

Why should I care?

Type checking will help you catch issues way earlier in the development cycle. It will also provide nice autocomplete features in your editor that will make you faster 󱐋.

Integrations

Parsers (v6e, pydantic, etc.)

CLIPy can be integrated with many parsers. The default recommended parser is v6e, which is automatically used if installed in your local environment to parse types more accurately. If you wish you specify any parser (from v6e or elsewhere) manually, you can do so quite easily:

CLI

import v6e
from clypi import Command, arg

class MyCli(Command):
    files: list[Path] = arg(parser=v6e.path().exists().list())

    async def run(self):
        files = [f.as_posix() for f in self.files]
        print(f"Linting {', '.join(files)}")

if __name__ == "__main__":
    cli: MyCli = MyCli.parse()
    cli.start()

Prompting

import v6e

hours = clypi.prompt(
    "How many hours are there in a year?",
    parser=v6e.float().lte(24).union(v6e.timedelta()),
)
reveal_type(hours)  # Type of "res" is "float | timedelta"